| mdurhan | -- 08-21-2011 @ 4:17 PM |
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Howdy, Boys: I've got a case or two of Motorcraft 15W-40 oil sitting on the shelf - left over from my "Power-stroke" days. Now, I have just bought me a '39 Deluxe. Will this oil be a good substitute for the original single viscosity, or do I need to get 20W-50? Much obliged. Mike Durhan
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| Bill Wright | -- 08-21-2011 @ 4:38 PM |
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Mike, I've been running Delo 15-40 in my "39 Merc for about three years. We started out with this weight when the engine was rebuilt. But it is far from stock.Bored,Scat rotating assembly,Harmon Collins Cam.I've had good luck with it and plan to stay with it. Bill Don't Believe Everything You Think! Bill Wright
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| 42guy | -- 08-21-2011 @ 7:56 PM |
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I have been using the 15-40 diesel oil for the past 9 years in my flathead. Dick
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| supereal | -- 08-22-2011 @ 11:43 AM |
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Mike: Just use it. If we run out of 20-50, we use 15-40, usually Rotella. Up until recently, oils designed for diesel engines used more ZZDP (zinc) than the type sold for gasoline engines. This has changed a bit as particulate filters are now becoming mandatory in some cases, and a urea solution is added by injection. The difference in zinc content isn't likely to affect the Ford flatheads. Those tough engines have survived for decades on various grades and weights of oil.
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| mdurhan | -- 08-23-2011 @ 3:18 PM |
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Thanks, boys. What a nice, helpful group of guys on this forum. You all are the best!!!! Mike
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